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 #include &lt;QtGui&gt;

 #include &quot;languagechooser.h&quot;
 #include &quot;mainwindow.h&quot;

 #ifdef Q_WS_MAC
 extern void qt_mac_set_menubar_merge(bool merge);
 #endif

 LanguageChooser::LanguageChooser(QWidget *parent)
     : QDialog(parent, Qt::WindowStaysOnTopHint)
 {
     groupBox = new QGroupBox(&quot;Languages&quot;);

     QGridLayout *groupBoxLayout = new QGridLayout;

     QStringList qmFiles = findQmFiles();
     for (int i = 0; i &lt; qmFiles.size(); ++i) {
         QCheckBox *checkBox = new QCheckBox(languageName(qmFiles[i]));
         qmFileForCheckBoxMap.insert(checkBox, qmFiles[i]);
         connect(checkBox, SIGNAL(toggled(bool)), this, SLOT(checkBoxToggled()));
         groupBoxLayout-&gt;addWidget(checkBox, i / 2, i % 2);
     }
     groupBox-&gt;setLayout(groupBoxLayout);

     buttonBox = new QDialogButtonBox;

     showAllButton = buttonBox-&gt;addButton(&quot;Show All&quot;,
                                          QDialogButtonBox::ActionRole);
     hideAllButton = buttonBox-&gt;addButton(&quot;Hide All&quot;,
                                          QDialogButtonBox::ActionRole);

     connect(showAllButton, SIGNAL(clicked()), this, SLOT(showAll()));
     connect(hideAllButton, SIGNAL(clicked()), this, SLOT(hideAll()));

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout-&gt;addWidget(groupBox);
     mainLayout-&gt;addWidget(buttonBox);
     setLayout(mainLayout);

 #ifdef Q_WS_MAC
     qt_mac_set_menubar_merge(false);
 #endif

     setWindowTitle(&quot;I18N&quot;);
 }

 bool LanguageChooser::eventFilter(QObject *object, QEvent *event)
 {
     if (event-&gt;type() == QEvent::Close) {
         MainWindow *window = qobject_cast&lt;MainWindow *&gt;(object);
         if (window) {
             QCheckBox *checkBox = mainWindowForCheckBoxMap.key(window);
             if (checkBox)
                 checkBox-&gt;setChecked(false);
         }
     }
     return QWidget::eventFilter(object, event);
 }

 void LanguageChooser::closeEvent(QCloseEvent * <span class="comment">/* event */</span>)
 {
     qApp-&gt;quit();
 }

 void LanguageChooser::checkBoxToggled()
 {
     QCheckBox *checkBox = qobject_cast&lt;QCheckBox *&gt;(sender());
     MainWindow *window = mainWindowForCheckBoxMap[checkBox];
     if (!window) {
         QTranslator translator;
         translator.load(qmFileForCheckBoxMap[checkBox]);
         qApp-&gt;installTranslator(&amp;translator);

         window = new MainWindow;
         window-&gt;setPalette(colorForLanguage(checkBox-&gt;text()));

         window-&gt;installEventFilter(this);
         mainWindowForCheckBoxMap.insert(checkBox, window);
     }
     window-&gt;setVisible(checkBox-&gt;isChecked());
 }

 void LanguageChooser::showAll()
 {
     foreach (QCheckBox *checkBox, qmFileForCheckBoxMap.keys())
         checkBox-&gt;setChecked(true);
 }

 void LanguageChooser::hideAll()
 {
     foreach (QCheckBox *checkBox, qmFileForCheckBoxMap.keys())
         checkBox-&gt;setChecked(false);
 }

 QStringList LanguageChooser::findQmFiles()
 {
     QDir dir(&quot;:/translations&quot;);
     QStringList fileNames = dir.entryList(QStringList(&quot;*.qm&quot;), QDir::Files,
                                           QDir::Name);
     QMutableStringListIterator i(fileNames);
     while (i.hasNext()) {
         i.next();
         i.setValue(dir.filePath(i.value()));
     }
     return fileNames;
 }

 QString LanguageChooser::languageName(const QString &amp;qmFile)
 {
     QTranslator translator;
     translator.load(qmFile);

     return translator.translate(&quot;MainWindow&quot;, &quot;English&quot;);
 }

 QColor LanguageChooser::colorForLanguage(const QString &amp;language)
 {
     uint hashValue = qHash(language);
     int red = 156 + (hashValue &amp; 0x3F);
     int green = 156 + ((hashValue &gt;&gt; 6) &amp; 0x3F);
     int blue = 156 + ((hashValue &gt;&gt; 12) &amp; 0x3F);
     return QColor(red, green, blue);
 }</pre>
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